Attachment for thread doubling and twisting machines



Apr. 17, 1923. 11,453,??11 M. F. was

ATTACHMENTFOR THREAD DOUBLING AND TWISTING MACHINES r r E aFiled April 1 [a Apr w, 1923. 1,451,771

' M. F. MASS ATTACHMENT FOR THREAD DOUBLING AND TWISTING MACHINES Filed April 18 1922 2 Sheets-Sheet 2 v mechanism illustrated in Fig. 1,

Patented Apr. 17, 1923.

PATENT OFFICE.

MARTIN F. HASS, OF WILKES-BARBIE, PENNSYLVANIA.

ATTACHMENT FOR THREAD DOUIBLING AND TWISTING MACHINES.

Application filed April 18, 1922.

17 0 all whom it may concern:

Be it known that I, MARTIN FRANCIS HAss, a citizen of the United States, and a resident of lVilkes-Barre, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in an Attachment for Thread Doubling and Twisting Machines of which the following is a specification.

My invention relates to improvements in an attachment for thread doubling and twisting machines and particularly for use in; connection with machines for twisting silk.

In machines of this general type there is provided feed rolls driven by gears and when the thread breaks these gears are exposed and the silk thread is thereby caught by and carried on by the still-rotating gear shafts, with the result that a large percentage of loss and damage to the silk is occasioned. Roll laps are formed on the roll shaft which binds and throws waste which comes in contact with the silk and causes slugs to be formed therein;

It is therefore the object of my present invention to provide a shield which will cooperate with the present shield. of machines now universally used to cover the exposed gear and eliminate these present objections. lVith this in mind. my invention relates to the novel combination and arrangement of parts more fully hereinafter described and illustrated in the accompanying specification and. drawings.

In the drawings:

Fig. 1 is a. fragmentary front elevation of a portion of a thread doubling and twisting machine with my invention applied thereto,

Fig. 2 is an enlarged fragmentary vertical section through a portion of th Figure 3 is a detail perspective view of a portion of the machine with certain parts omitted,

F ig. 4 is a central longitudinal section through the structure illustrated in Fig. 8, and,

Fig. 5 is a: similar view with the parts in a different position.

In the drawings, only so much of a doubling and twisting machine is shown as Serial No. 554,830.

to enable those skilled in the art to understand the manner in which my improved invention operates. By referring particularly to Figs. 1 and 2 it will be seen that a plurality of. threads 10 pass through eyes 11 which form a part of a safety stop mechanism 12. This safety stop mechanism operates to disengage the driving gears of the feed rolls when a thread 10 becomes broken. This safety stop mechanism disengages these gears by releasing a shaft 13 which then moves upwardly under the action of a spring 14. V

The threads 10 pass downwardly through an eye 15 and around a pair of feed rolls 16 driven by gears 17 meshing with a driw ing gear 18. The driving gear 18 is carried upon a driving shaft 19 which is constantly rotating. Secured to the rod 13 is a feed roll stand 20 which encloses the gear plnions 17 from the top thereof and upon which feed rolls 16 are journalled. Because this feed roll stand 20 is fixed rigidly to the shaft 13 it moves upwardly with said shaft when the safety stop mechanism releases this shaft thereby disengaging the gear pinion 17 from the drive gear 15?. Positioned around the drive gear 18 and drive shaft 19 is a shield 21 formed with an enlargement 22 covering the drive gear 18. The parts of the machine thus far described are of well-knownand approved form and form no part of this present invention.

However, as mentioned hereinbefore, when any of the threads 10 become broken, thus causing the safety stop mechanism to disengage the gear pinions 17 of the feed rolls. the drive gear 18 is left exposedv and. consequently the thread is caught and carried on the shaft of this gear which binds and throws waste aroundicausing slugs in the silk. Therefore, in order to eliminate this objection, I provide a shield formed of a. pair of hinged sections 23 which are adapted. in the stop position of the machine, or in other words. in the position where the pinion gears 17 are disengaged from. the driving gear 18, to cover the drive gear 18.

see particularly Fig. 1. One section 23 is pivotally secured to a casting 2 1 secured as by bolts 25 or the like to the front end of the roll stand 20. This Section 23 of the shield is pivotally supported on the casting 24 by a shaft 26 and a spring 27 coiled around the shaft 26 and engaging with its ends the casting 24 and the shield section 23 respectively tends to move this shield section 23 to the position illustrated in Fig. 4.

The other shield section 23 is pivoted by ears 28 onto a shaft 29 carried by a support 30 fixed to the shaft 13 by a set screw 31 or the like. A spring 32 coiled around the shaft 29 and engaging with its ends upon the shield 'section 23 and the support 30 respectively tends to cause this shield section to assume the position illustrated in Fig. 4.

Each shield section 23 is substantially U- shaped in cross-section and is adapted to bear, with one of its substantially vertical sides upon the positive shield 21. The sides of one of the shield sections is provided with an angular flange 23 bearing upon the positive shield 21 while the other shield section 23 engages with its vertical side againstthe edge 21 of the positive shield which is cut away at this point for the reception of the shieldsection 23. Therefore, as the feed roll stand 20, and shaft 13 are lowered to cause the "feed roll gears 17 to mesh with the drive gear 18, the shield sections 23 by reason of their engagement with the positive shield 21 are swung upwardly and away from one another and against the tension of their respective springs to the position illus trated in Fig. 5. In this position they are clear of the engaging face of the drive gear 18 which is then able to mesh with the gear pinions 17 of the feed rolls 16. Obviously, when the safetv stop mechanism 12 disengages the rod 13 which moves the feed roll stand 20 and the feed rolls 16 upwardly, then the shield sections 23 will by reason of their associated springs again assume the position illustrated in Figs. 3 and 4E and cover the gear 18. Therefore, the shield sections 28 together with the positive shield 2122 completely houses the constantly rotating drive gear 18 and drive shaft 19.

Therefore even though the thread 10 has become broken, it will not be caught in these rotating parts and the objections noted hereinbefo-re in the present form of ma-. chines will be eliminated.

In this connection it should be noted that my improved attachment may be applied to the present type of twisting and doubling machines merely by cutting off a short length of the depending end of the roll stand where the casting 241 is secured and cutting away a slight portion of the rear edge of the *ositive shield 21 so as to accommodate the support 30 and the vertical edge of the adjacent shield section 23.

While the structural embodiment of my invention illustrated herein has proven to be satisfactory and efiicient in every detail, I do not wish to be unnecessarily limited as regards this specific arrangement, but reserve the right to make such changes and modifications as mav come within the purview of the accompanying claims.

Having thus described my invention, what I claim is:

1. The combination with a thread doubling and twisting machine having feed roll gears and a drive gear of a spring-actuated shield adapted to enclose said drive gear when said gears are disengaged.

2. The combination with a machine of the class described having a drive gear and feed roll. pinions movable into and out of engagementwith said drive gear of a sectional spring shield. mounted to cover said drive gear when said gears are disengaged.

3. The combination withi a thread doubling and twisting machine provided with a continuously driven drive gear and automatically disengageable feed roll pinions of a two-part spring-actuated shield and means for mounting said shield so that the same will more to cover said drive gear when said gears are disengaged.

4. In a thread doubling and twisting machine, a continuously rotated drive gear, a fixed positive shield therefor, drive roll pinions nounted so to be movable into engagement with said drive gear and a spring shield mounted to move with said drive roll pinions and adapted to cover said drive gear when said are disengaged.

5. In a thread twisting and doubling machine, a constantly rotating drive gear, a. positive shield therefor, a pair of feed roll pinions, a feed roll stand supporting said pinions and movable to cause said pinions to engage said drive gear and a spring shield mounted on said feed roll stand for covering said drive gear when said gears are disengaged, said shield. being moved to inoperative position by engagement with said positive shield. when said gears are in engagement.

6. The combination with a machine of the class described having a drive gear and feed roll pinions movable into and out of engagement with said drive gear of a two-part shield mounted to move toward said drive gear to enclose the same when said gears are disengaged.

MARTIN F. H ASS. 

